Had to upgrade build-tools to the last version, which caused error #4.

– #4 Device was not found when running the app (“Nothing to show”).

ADB was not starting. I discovered that by clicking on “Android monitor” to see logcat, and adb was returning an error.
This issue was caused because my system is ubuntu 32-bit.

Solution:
I had to downgrade platform-tools folder to v23.0.1. Seehere
After downloading the folder in the link, and replacing my /home/user/android-sdk/platform-tools for this one, apps are launching succesfully in my Android device